Mine was when I was 3 or 4. I was at a parade with my parents. It was summertime, so it was most likely a 4th of July parade. From far off, I could hear the marching band approaching. My excitement began to grow. I loved the coordinated movement, the uniforms, the music. The sound begins to build; they are moving closer. The melody wafts over me. And then the rhythm enters my body and I become synchronized with it, propelled by it. And here comes the line of bass drums! Their beating FILLS THE CAVITY OF MY CHEST AND MY HEART ITSELF BECOMES A DRUM! I close my eyes, perhaps even cover my ears, a small smile on my face. I don't even need my ears, because I am listening with my whole body. It's exquisite, almost too much...almost too much... And then they are gone. The reverberations drain out of my body. I am slightly chagrined, hoping no one noticed my ecstasy.
There are more marching bands to come. I can hardly wait.